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The colonization of foreign species into the Mediterranean Sea has increased in number and geographic coverage over the past decades. For instance, the marine mollusc Haminoea cyanomarginata has scattered across the Central and Eastern Mediterranean since its description in the Red Sea by Heller and Thompson in 1983. In this study, we add the first records of the species in the Western Mediterranean basin and review the progression of its colonization from the Red Sea. The new records were obtained through the online database of the NGO called Catalan Opisthobranch Research Group (Spain), thus highlighting how citizen science platforms can provide an early warning for marine scientists and managers in relation to exogenous species.